do I need an additive in my 8 3/4 sure grip?

BlueDream said

I'd fix the leak first and then put in the correct oil with the limited slip additive.

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Ultimately, this ^^ is the best route.

Jeff, keep in mind that it's a must to have the additive, it lets the suregrip 'slip', if you will, during normal driving conditions, it helps the unit to not wear out prematurely.